SAM · Discrete trunk · leaf
Counting is choosing, and the two questions are whether order matters and whether repeats are allowed.
Before this leaf: Logic and sets.
This leaf feeds: Probability.
Objects you will meet again: the dial.
One row per lesson, in the order the leaf builds up. Each lesson holds its notes, its demos and its challenges on one page. A demo link opens the lesson at that demo.
This leaf is planned. Its lessons are being designed now, and each one appears here when it is built. The strip above shows its planned length.
Probability cannot start without it; keyspace sizes and the birthday bound are counting arguments with immediate bite for security students.
Every new word from this leaf appears here, with one sentence and the lesson that introduces it.
The sequencing for this leaf is published with its first lessons.